Pioneer Masters

Medomai the Ageless | Legendary Creature | Sphinx | Flying Whenever Medomai the Ageless deals combat damage to a player, take an extra turn after this one. Medomai the Ageless can't attack during extra turns. | David Palumbo

Render Silent | Instant | | Counter target spell. Its controller can't cast spells this turn. | Matt Stewart

Ashen Rider | Creature | Archon | Flying When Ashen Rider enters or dies, exile target permanent. | Chris Rahn

Boros Reckoner | Creature | Minotaur Wizard | Whenever Boros Reckoner is dealt damage, it deals that much damage to any target. {R/W}: Boros Reckoner gains first strike until end of turn. | Howard Lyon

Aurelia's Fury | Instant | | Aurelia's Fury deals X damage divided as you choose among any number of targets. Tap each creature dealt damage this way. Players dealt damage this way can't cast noncreature spells this turn. | Tyler Jacobson

Fleecemane Lion | Creature | Cat | {3}{G}{W}: Monstrosity 1. (If this creature isn't monstrous, put a +1/+1 counter on it and it becomes monstrous.) As long as Fleecemane Lion is monstrous, it has hexproof and indestructible. | Slawomir Maniak

Notion Thief | Creature | Human Rogue | Flash If an opponent would draw a card except the first one they draw in each of their draw steps, instead that player skips that draw and you draw a card. | Clint Cearley

Counterflux | Instant | | This spell can't be countered. Counter target spell you don't control. Overload {1}{U}{U}{R} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.") | Adrián Rodríguez Pérez

Bring to Light | Sorcery | | Converge — Search your library for a creature, instant, or sorcery card with mana value less than or equal to the number of colors of mana spent to cast this spell, exile that card, then shuffle. You may cast that card without paying its mana cost. | Jonas De Ro

Unexpected Results | Sorcery | | Shuffle your library, then reveal the top card. If it's a nonland card, you may cast it without paying its mana cost. If it's a land card, you may put it onto the battlefield and return Unexpected Results to its owner's hand. | Mike Bierek

Sire of Insanity | Creature | Demon | At the beginning of each end step, each player discards their hand. | Joshua Raphael

Rakdos's Return | Sorcery | | Rakdos's Return deals X damage to target opponent or planeswalker. That player or that planeswalker's controller discards X cards. | Daarken

Lotleth Troll | Creature | Zombie Troll | Trample Discard a creature card: Put a +1/+1 counter on Lotleth Troll. {B}: Regenerate Lotleth Troll. | Vincent Proce

Jarad's Orders | Sorcery | | Search your library for up to two creature cards and reveal them. Put one into your hand and the other into your graveyard. Then shuffle. | Svetlin Velinov

Ruric Thar, the Unbowed | Legendary Creature | Ogre Warrior | Vigilance, reach Ruric Thar, the Unbowed attacks each combat if able. Whenever a player casts a noncreature spell, Ruric Thar deals 6 damage to that player. | Tyler Jacobson

Chromanticore | Enchantment Creature | Manticore | Bestow {2}{W}{U}{B}{R}{G} (If you cast this card for its bestow cost, it's an Aura spell with enchant creature. It becomes a creature again if it's not attached to a creature.) Flying, first strike, vigilance, trample, lifelink Enchanted creature gets +4/+4 and has flying, first strike, vigilance, trample, and lifelink. | Min Yum